Please this part is hard for me to understand. Can anyone answer these please?

Not 100 percent sure but number 2 and 3 dont make a polygen, they only make a line. so 0.

For the fourth one i am not 100 percent sure. I think it makes unlimited polygons.

Step-by-step explanation:

Again, not 100 percent sure.

The best way to find out is to draw them.

I matched the two points of 2 and 3 and they make a line they dont make a polygen as for the last one i dont think it makes any

step-by-step explanation:

∆abc has the points a(1, 7), b(-2, 2), and c(4, 2) as its vertices. formed with the point d(1, 2) as its third vertex, then ∆abd is triangle.